Child safety seat



FIG. 1 is a perspective view of a child safety seat showing my new design;

FIG. 2 is a right side view thereof, the left side view being a mirror image thereof;

FIG. 3 is a front end view thereof;

FIG. 4 is a rear end view thereof; and,

FIG. 5 is a top plan view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a child safety seat, as shown and described. 